Editing 1878 (section)

===April&ndash;June===
* [[April 16]] &ndash; The [[Senate of the Grand Duchy of Finland]] issues a declaration establishing a city of [[Kotka]] on the southern part of the islands from the [[Kymi, Finland|old Kymi parish]].<ref>[http://www.kotka.fi/default.asp?link=110.5 Kotkan synty ja kasvu] {{Webarchive|url=https://web.archive.org/web/20150520225231/http://www.kotka.fi/default.asp?link=110.5 |date=May 20, 2015 }} (in Finnish)</ref>
* [[April 20]] &ndash; The [[Stawell Gift]] sprint is run for the first time in Australia.
* [[May 1]]–[[November 10]] &ndash; [[Exposition Universelle (1878)|Exposition Universelle]], a [[world's fair]], is staged in Paris. In June some parts of the city are first lit by '[[Yablochkov candle]]s' ([[arc lamps]]) and on June 30 the head of the [[Statue of Liberty]] goes on display there.
* [[May 2]] &ndash; The [[Washburn "A" Mill]] in [[Minneapolis]] explodes, killing 18.
* [[May 15]] &ndash; The [[Tokyo Stock Exchange]] is established.
* [[May 25]] &ndash; [[Gilbert and Sullivan]]'s [[comic opera]] ''[[H.M.S. Pinafore]]'' debuts in [[London]] at the [[Opera Comique]], with a first run of 571 performances.
* [[June 1]]
** The General Postal Union is renamed the [[Universal Postal Union]] (UPU).
** British [[clipper]] ''[[Loch Ard (ship)|Loch Ard]]'' is wrecked off the [[Shipwreck Coast]] of [[Victoria (Australia)]] with the loss of 52 lives and only 2 survivors.<ref>{{cite news|url=http://nla.gov.au/nla.news-article5934740|title=The Loch Ard Lost|newspaper=[[The Argus (Melbourne)|The Argus]]|issue=9972|location=Melbourne|date=3 June 1878|access-date=2017-03-09|page=5|via=National Library of Australia}}</ref>
* [[June 4]] &ndash; [[Cyprus Convention]]: The [[Ottoman Empire]] cedes [[Cyprus]] to the United Kingdom, but retains the nominal title.
* [[June 10]] &ndash; The [[League of Prizren]] is officially founded "to struggle in arms to defend the wholeness of the territories of [[Albania]]".
* [[June 13]]&ndash;[[July 13]] &ndash; The [[Congress of Berlin]] convenes to discuss the [[Ottoman Empire]].
* [[June 15]] &ndash; [[Eadweard Muybridge]] produces the first sequence of stop-motion still photographs ''[[The Horse in Motion]]'' in [[California]] (a predecessor of [[silent film]]), demonstrating that all four feet of a [[Horse gait#Gallop|galloping horse]] are off the ground at the same time.
* [[June 20]] &ndash; The United States Coast Survey is renamed the [[United States Coast and Geodetic Survey]].
* [[June 22]] &ndash; [[Adolf Erik Nordenskiöld]] leaves [[Karlskrona]] on a voyage that will make him the first man to navigate the [[Northern Sea Route]], a shipping lane from the Atlantic Ocean to the Pacific Ocean, along the [[Siberia]]n coast.
* [[June 25]] &ndash; The [[Kanak]] people of [[New Caledonia]] [[1878 Kanak revolt|revolt]] against the French colonial government.